Question # 1

In endothermic reactions, the heat contents of the:

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Products equal to the reactants.

Reactants more than that of products.

Products more than that of reactants

Both (b) and (c)

When a piece of zinc is added to the copper sulfate solution,____________ color of solution disappear.

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Pink.

Purple.

Blue.

Brown.

In a chemical change, the energy in the form of heat will either be evolved or absorbed and this is called

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Endothermic

Heat of products

Exothermic reaction

Heat of reaction

Which one of the following is not related to spontaneous process

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Unidirectional

Real

Irreversible

Artificial

The change in heat energy of a chemical reaction at constant temperature and pressure is called

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entahlpy change

heat of sublimation

bond energy

internal energy change

Neutralization of a strong acid with a strong base is

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Natural acid base reaction

Artificial acid base reaction

Spontaneous acid base reaction

both a and c

By comparing both initial and final states of the system, we can describe the change taking place in the

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Surrounding

Both a and c

System

None of above

Neutralization of a strong acid with a strong abase is:

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Natural acid base reaction.

Artificial acid base reaction.

Spontaneous acid base reaction.

Both (a) and (c).

The real or imaginary surface separating the system from the surrounding is called

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Imaginary line

Boundary

Real line

All of above

When no work is done by the system

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The volume of system decreases

The volume of system increases

The volume of system does not change

None of above

If an endothermic reaction is allowed to take place very rapidly in air, the temperature of the surrounding air

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Remains constant

Decreases

Increases

Fluctuates rapidly

The subject matter of first law of thermochemistry is based on:

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First law of Themochemistry.

First law of Thermodynamics.

Second law of Themochemistry.

Second law of Thermodynamics.

The study of heat changes accompanying a chemical reaction is known as :

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Thermochemistry.

Biochemistry.

Physical chemistry.

Analytical chemistry.

If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air:

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Remains constant.

Increase.

Decreases.

Remain unchanged.

The subject matter of first law of thermochemistry is based on

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First law of Thermochemistry

First law of Thermodynamics

Second law of Thermochemistry

Second law of Thermodynamics

By state, we mean the

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Reaction of system

Scope of a system

Condition of a system

None of above

Burning of coal and hydrocarbon in air are examples of :

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Non-spontaneous reaction.

Spontaneous reaction.

Natural reaction

Both (a) and (C)

Work is a

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State function

Only function

Non-state function

State

A reaction will also be called a spontaneous if :

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It does no need energy to start with.

It needs energy to carry the whole process.

It needs energy at the end of reaction.

It needs energy to stat with.

Some Non-spontaneous process can be made to take place by supplying energy to the system from :

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Internal source.

Any source.

External source.

All of above.

Enthalpy of neutralization of all the strong acids and strong bases has the same value because:

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Neutralization leads to the formation of salt and water.

Strong acids and bases are ionic substances.

Acids always give rise to H⁺ions and bases always furnish OH^-ions.

The net chemical change involve the combination of H⁺ and OH^-ions to form water.

The energy units in which heat changes usually expressed in SI-system are

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Joule

Calorie

Kilo Joule

Both a and c

For a given process, the heat changes at constant volume ( q_v)are related to other as:

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q_p= q_v

q_p<q_v

q_p>q_v

q_p=q_v/2

It is noticed that energy in the form of heat is either evolved or absorbed as a result of a

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Physical change

Chemical change

Biological change

All of above

When a piece of zinc is added to the copper sulphate solution, _______ colour of solution disappear

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Pink

Purple

Blue

Brown

A process which takes place on its own without any outside assistance and moves from a non-equilibrium stat towards an equilibrium stat is termed as:

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Spontaneous process.

Natural process.

Non-Spontaneous process.

Both (a) and (b).

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